Tharp, R. (2012). Delta theory and psychosocial systems. Cambridge Uni Press.
Chicago-čujuhus (17. p.)Tharp, R. Delta Theory and Psychosocial Systems. New Delhi: Cambridge Uni Press, 2012.
MLA-čujuhus (9. p.)Tharp, R. Delta Theory and Psychosocial Systems. Cambridge Uni Press, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.